Examples

Among the items quickly snapped up was an exquisite orange and yellow glass piece made to imitate realgar, a poisonous mineral that is almost pure sulphide of arsenic, beautiful to the eye but poisonous to the touch (price: around €2,000).

Orange-coloured grounds may be formed by mixing vermilion or red lead with King's yellow, or orange lake or red orpiment (? realgar) will make a brighter orange ground than can be produced by any mixture.

It occurs as metallic arsenic, which is of a steel-grey colour, brittle, and gives off a garlic-like odour when heated; as arsenious acid; in the form of two sulphides -- the red sulphide, or realgar, and the yellow sulphide, or orpiment; and as arsenite of copper, or Scheele's green.